op 	 {
  name: "CountUpTo"
  input_arg {
    name: "ref"
    type_attr: "T"
    is_ref: true
  }
  output_arg {
    name: "output"
    type_attr: "T"
  }
  attr {
    name: "limit"
    type: "int"
  }
  attr {
    name: "T"
    type: "type"
    allowed_values {
      list {
        type: DT_INT32
        type: DT_INT64
      }
    }
  }
}
